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      <h1>Zodiac Decoder</h1>

      <h2>UNT Symbolic Processing</h2>
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        In considering the linguistic properties of the 340-cipher,
        we took a thorough analysis of both the it and the
        original, three part 408-cipher. In the 340-cipher, there
        are 63 unique characters used in the cipher, most of them
        latin characters, latin characters mirrored, and shapes,
        such as a circle with a cross (which the Zodiac used as his
        signature), and circles, square, and triangles with
        different designs in them. In order to be process the
        individual characters, each symbol was given a two digit
        number that corresponded to its position in the cipher
        where it was first used. For example, the first character
        is 00, the second character 01, and so on. We performed a
        frequency analysis on the cipher using a custom program.
        [insert frequency chart] The results showed that we could
        not easily use a frequency analysis to break the cipher.
        Using a separate custom program, we analyzed the n-grams of
        cipher (where n=2,3,4,5). The results showed that the
        Zodiac was very good at keeping away from patterns. Very
        few digrams or trigrams were repeated in the cipher. We
        also used the program to analyze a large body of English
        text. The scoring algorithms uses these statistics the
        score the solutions. Finally, a separate program was
        developed in order to take the body of Zodiac letters and
        keep statistics of what words were used by the Zodiac,
        including misspellings, and use this in the dictionary for
        the client.
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      <p>© 2007 University of North Texas</p>

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